From 61aef00dc4deb72dcd8f5ec14b58dcc458286cf2 Mon Sep 17 00:00:00 2001
From: ryan <ryan@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Mon, 2 Jan 2012 21:31:27 +0000
Subject: [PATCH] An empty database prefix is not supported for multisite.
 <small>Add a sanity check anyway.</small> fixes #19566 for 3.3

git-svn-id: http://svn.automattic.com/wordpress/branches/3.3@19643 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/user.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-includes/user.php b/wp-includes/user.php
index ce10509223..2b0508fad8 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -696,7 +696,7 @@ function get_blogs_of_user( $user_id, $all = false ) {
 	foreach ( $keys as $key ) {
 		if ( 'capabilities' !== substr( $key, -12 ) )
 			continue;
-		if ( 0 !== strpos( $key, $wpdb->base_prefix ) )
+		if ( $wpdb->base_prefix && 0 !== strpos( $key, $wpdb->base_prefix ) )
 			continue;
 		$blog_id = str_replace( array( $wpdb->base_prefix, '_capabilities' ), '', $key );
 		if ( ! is_numeric( $blog_id ) )